Hi,
I got a question from my friend, if user gives input 6 or any number it should show matrix in the form of normal and Spiral assigned values.
Matrix Size is: 6
Normal Matrix is:
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
19 20 21 22 23 24
25 26 27 28 29 30
31 32 33 34 35 36
Spiral Matrix is:
1 2 3 4 5 6
20 21 22 23 24 7
19 32 33 34 25 8
18 31 36 35 26 9
17 30 29 28 27 10
16 15 14 13 12 11
I had gone through the problem, got it can be solved in 4 recurring steps.
package newlearn;
import java.util.Scanner;
/**
*
* @author Ramakrishna Panni
*
*/
public class SpiralMatrix {
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
System.out.println("Enter matrix size to get spiral matrix");
Scanner sc = new Scanner(System.in);
String[] inter = sc.nextLine().trim().split(" ");
int size = Integer.parseInt(inter[0]);
System.out.println("Matrix Size is: "+size);
sc.close();
int higestValue = size*size;
int spiralMatrix[][] = new int[size][size];
int normalMatrix[][] = new int[size][size];
int normalValue = 0;
for(int i=0;i<size;i++)
{
for(int j=0;j<size;j++)
{
normalMatrix[i][j] = ++normalValue;
spiralMatrix[i][j] = 0;
}
}
System.out.println("Normal Matrix is:\n");
for(int i=0;i<size;i++)
{
for(int j=0;j<size;j++)
{
System.out.printf("%5d",normalMatrix[i][j]);
}
System.out.println("");
}
int lastValue=0;
int step = 1;
int step1Col = 0;
int step1Row = 0;
int step2Col = 0;
int step2Row = 0;
int step3Col = 0;
int step3Row = 0;
int step4Col = -1;
int step4Row = 0;
while (lastValue < higestValue) {
step = 1;
//this is the step where value assigned in Horizontal incrementing positional way
if(step == 1)
{
step1Row = step4Row;
step1Col = ++step4Col;
for(int j=step1Col;j<size;j++)
{
if(spiralMatrix[step1Row][j] == 0)
{
spiralMatrix[step1Row][j] = ++lastValue;
step1Col = j;
}
else{
break;
}
}
step = ++step;
}
//this is the step where value assigned in Vertical incrementing positional way
if (step == 2)
{
step2Col = step1Col;
step2Row = step1Row+1;
for(int i=step2Row;i<size;i++)
{
if(spiralMatrix[i][step1Col] == 0)
{
spiralMatrix[i][step1Col] = ++lastValue;
step2Row = i;
}
else{
break;
}
}
step = ++step;
}
//this is the step where value assigned in Horizontal decrementing positional way
if(step==3)
{
step3Row = step2Row;
step3Col = step2Col-1;
for(int j=step3Col;j>=0;j--)
{
if(spiralMatrix[step3Row][j] == 0)
{
step3Col = j;
spiralMatrix[step3Row][j] = ++lastValue;
}
else{
break;
}
}
step = ++step;
}
//this is the step where value assigned in Vertical incrementing decrementing positional way
if(step==4)
{
step4Row = --step3Row;
step4Col = step3Col;
for(int i=step4Row;i>=0;i--)
{
if(spiralMatrix[i][step4Col] == 0)
{
step4Row = i;
spiralMatrix[i][step4Col] = ++lastValue;
}
else{
break;
}
}
step = ++step;
}
}
System.out.println("Spiral Matrix is:\n");
for( int i=0;i<size;i++)
{
for( int j=0;j<size;j++)
{
System.out.printf("%5d ",spiralMatrix[i][j]);
}
System.out.println("");
}
}
catch(Exception e)
{
e.printStackTrace();
System.out.println("Something Went wrong............Please run again.....");
}
}
}
